hackerrank上的数字频率问题 [英] Digit frequency problem on hackerrank

问题描述

问题链接： HackerRank [ ^ ]



这是我的解决方案我想知道它有什么问题



我尝试了什么：

Problem Link : HackerRank[^]

here is my solution i want to know what's wrong with it

What I have tried:

int main()
{

    int i = 0 , resultArr[10];
    char buffer = 0;

    do
    {
        scanf("%c",&buffer);
        for ( i = 0 ; i < 10 ; i++)
        {
            if ((buffer - '0') == i)
                resultArr[i]++;
        }
    }
    while(buffer != '\n');


    for ( i = 0 ; i < 10 ; i++)
        printf("%d ",resultArr[i]);

    return 0;
}

推荐答案

Quote：

这是我的解决方案我想知道它有什么问题

here is my solution i want to know what's wrong with it

尝试用零初始化 resultArr [10] 。它可能会有所帮助。

Try to start by initialize resultArr[10] with zeroes. It might help.

正如 ppolymorphe 指出的那样，你需要对数组项进行零初始化。

As ppolymorphe pointed out, you need to zero-initialize your array items.

int resultArr[10] = {0};

就足够了。



请注意以下内容代码应该更快：

is just enough.

Please note the following code should be faster:

#include <stdio.h>
int main()
{

    int i = 0 , resultArr[10] = {0};
    char buffer = 0;

    do
    {
        scanf("%c",&buffer);
        if ( buffer >= '0' && buffer <= '9' )
          ++resultArr[buffer-'0'];
    }
    while(buffer != '\n');


    for ( i = 0 ; i < 10 ; i++)
        printf("%d ",resultArr[i]);

    return 0;
}

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